Broken underbody studs

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Grim Grim
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Grim Grim PCGB Member
2018/06/12 18:03:39 (permalink)

Broken underbody studs

I need to fit a new rear undertray to my 1990 964 C4. On inspecting the underside I found that many of the short threaded studs for the plastic nuts for retaining undertrays and side skirts were snapped and too short to use. Has anybody else found this, and what have been your solutions? I shudder at the thought of using self-tappers.

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    mcgc0
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    mcgc0 PCGB Member
    Re: Broken underbody studs 2018/06/12 18:11:52 (permalink)
    Grind down the broken stud flush with the underbody, drill out the stud then try using a rivstud. This is what many who have done this say is the best sturdy alternative.
     
    This useless limited forum platform doesn't allow copy 'n paste images or images to be uploaded into the posting. So exaamples of rivstuds here - http://studs.m88play.com/rivet-type-studs/
     



    '90 964 C4 Velvet Red
    '94 968 Sport Gaurds Red
    '90 964 C4 Slate Grey
    '03 Focus ST
    '02 Focus ST
    Gordon Attar
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    Gordon Attar PCGB Member
    Re: Broken underbody studs 2018/06/12 19:21:07 (permalink)
    Easier alternative to get you by are cable ties

    Gordon
    964 C2 Cab, 996TT
    ex cars 944S2, 964 Targa, 944T, 993 Cab, 993 Targa, 993 C4S, 993TT, 996TT
    Grim Grim
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    Grim Grim PCGB Member
    Re: Broken underbody studs 2018/06/13 17:26:26 (permalink)
    Thank you, I'd contemplated something of this nature, but did not know that they were readily available.
    Grim Grim
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    Grim Grim PCGB Member
    Re: Broken underbody studs 2018/06/13 17:28:47 (permalink)
    It was due to a makeshift repair of this type that I need a new undertray, and it does not adress the problem of the side skirt nuts. But thank you for the suggestion.
    Ray
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    Ray PCGB Member
    mcgc0
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    Re: Broken underbody studs 2018/06/13 22:00:23 (permalink)
    Rivstuds (and opposite nuts) are the favoured choice for permanent fixing alternatives.
     
    Ray is right too - you can never have enough fastenings and fixings - plastic or stainless steel! :)

    '90 964 C4 Velvet Red
    '94 968 Sport Gaurds Red
    '90 964 C4 Slate Grey
    '03 Focus ST
    '02 Focus ST
    Dekker
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    Dekker PCGB Member
    Re: Broken underbody studs 2018/06/15 11:51:27 (permalink)
    I like the DIY tool inserter for Rivnuts
    https://www.youtube.com/watch?v=AfQIYLSKGwI
     
    post edited by Dekker - 2018/06/15 11:53:02

    David Bladon
    964 Register Secretary
    964 C4 Cabriolet Cobalt Blue
    964 C2 Coupe Marine Blue
    SAAB 900 T16 Ruby 1993 all weather
    Ray
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    Ray PCGB Member
    Re: Broken underbody studs 2018/06/15 12:10:26 (permalink)
    Dekker
    I like the DIY tool inserter for Rivnuts
    https://www.youtube.com/watch?v=AfQIYLSKGwI
     


    My rivet gun expands rivnuts but for only small diameter bolts. You can use a bolt, locking nut and two spanners. Aluminum rivnuts are the easiest to expand. The fitting of stainless steel rivnuts is a lot more difficult without the proper expansion tools.
     
    Ray 
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